Grinding machine



GR I mama MACHINE nlei Aug. 29 1928 '5 Sheets-Sheet 1 INVENTOR mass QHL/ne,

ATTORNEY March 31, 1931. c. H. LYNE GRINDING MACHINE Filed Aug. 29, 19283 Sheets-Sheet 2 5aaSEES555555??? INVENTOR WlTNESS ATTORN EY March 31,1931. c. H. LYNE 1,799,109

GRINDING MACHINE Filed Aug. 29, 1928 5 Sheets-Sheet 3 INVENTOR wwuzssafl y ATFORNEY Patented Mar. 31, 1931 UNITED STATES PATENT OFFICECHARLES H. LYN E, OF MIAMI, FLORIDA eanmme MACHINE Application filedAugust/29, 1928. Serial No. 302,824.

My invention relates to grinding machines,

and moreparticularly to a portable machine for use in conjunction withmanhole casings and their covers.

Further, the invention provides a machine wherebyemanhole casings andcovers therefor may expeditiously ground or polished to permit the coverto seat accurately within the manhole casing.

This invention also contemplates a grinding or polishing machine whichis adjustable to bring a rotating abrasive element into desired positionand which. is capable of traversing the work to reach any point aboutits circumference.

Anotherobject of the invention is to provide'a rotary work support foruse in connection with my improved grindin machine when it is desired togrind or polis circular objects such as manhole covers.

With the preceding and other objects and advantages in mind, theinvention consists in the combination of elements constructions andarrangements of parts and operations to be hereinafter specificallyreferred to, claimed and illustrated in the accompanying drawingswherein Figure 1 is a side elevation of the inven-' tion in operativeposition on a manhole cas: e; 7

Figure 2 is a to plan view of the same;

Figure 3 is a orizontal sectional view taken on line 33 of Figure 1;

Fi ure 4 is a vertical section taken on substantlally the plane -4-4indicated on Figure 2;

Figure 5 is a side elevation of a modification of the invention.

Figure 6 .is a top plan view of the work holder;

Fi re 7 is a transverse section taken line -7 of Figure 6.

Referring to the invention in detail, and more particularly to theconstruction disclosed in Figures 1-4 inclusive, a circular trackway 5is provided and is adapted to be positioned on the npperedge of amanhole casing 6. Set screws 7 are carried by the trackway for securingthe latterto the manhole casing being operated on A substantiallysemi-circular carriage or casting 8 is arranged above the trackway 5 andcarries a plurality. of radially disposed flanged rollers 9, the latterbeing mounted on lugs 10 depending from the under face of the carriage.For the purpose of rotating the carriage on the trackway, the carriageis provided with an opening 11 in its periphery for the reception ,.O.,.a--handle or suitable implement. Li a A suitable electric moto'r 12 ismounted on the carriage with its shaft 13 extending v-ertically andprojecting downwardly below thecarriage and carries a circular abrasiveelement 14 on its lower end. In abrasive element is adapted to grind orpolish practice, the

the usual manhole casing-cover seat provided I forwardly projecting partof the anglebracket is provided with a horizontally disposed dove-tailgroove 16 which is closed at its forward end. Mounted within this grooveis a horizontally arranged screw 17, the latter projecting beyond theangle bracket and carries a hand grip 18. Arranged to one side of theforwardly projecting part of the angle bracket is a vertically arrangedplate 19 provided with a dove-tail tongue 20 upon its inner face whichis receivedin the groove 16.

The dove-tail tongue 20 is provided with an internally threadedhorizontally disposed bore 21 through which the screw 17 passes so thatupon rotation of this screw, the .plate 19 will be shifted in ahorizontal direction.

The outer face of the plate 19 is formed with a vertically extendingdove-tail groove 22 and journaled in this plate and passing through thegroove '22 is a screw 23 having a hand'grip 24 at its upper end. 'Ablock. s

or casting 25 is arranged in advance of the plate 19 and is formed witha dove-tail tongue 26 provided with a vertically disposed in-Q ternallythreaded bore 27 through which the screw 23 passes. The block or casting25 terminates in laterally projecting plates or flanges 28 to which theends of the motor 12 are bolted or otherwise secured as at 29.

A'suitable conductor 30 leads to the motor for carryingelectrical energyfrom any desirable source While a suitable switch 31 is attacheddirectly to the motor casing for controlling the flow of electricalenergy to the motor.

It will beobserved that the abrasive element may be adjusted verticallyand laterally to bring the same in contact with the work. With the motorin operation the carriage is manually rotated slowly so that theabrasive element will contact with the entire area of the seat of themanhole casing to remove all uneven surfaces therefrom.

For the purpose of grinding manhole casing covers, the constructiondisclosed in Figures 5-7 inclusive is provided. In this construction,the manhole cover is retained in an inverted position on a circularturn-table 32 carrying a central vertical shaft 33 revoluble in a bearin34 arising from a horizontally disposed base plate 35. The turn table isprovided with an upstanding annular flange 36 of less height than theheight of the manhole cover so that the surface of the latter willproject above the flange as illustrated. Pairs of radially disposedperforated ears 37 are formed on the outer face of the flange, any pairof which is adapted to be engaged by a lever or implement when it isdesired to rotate the turn-table.

In order to adjust the manhole cover to the desired position forgrinding, a plurality of radially disposed blocks 38 is disposed uponthe bottom of the turn table at the edges of the latter and have theirunder faces bevelled as at 39. These blocks are adjustable over inclinedsurfaces 40 on the bottom of the turntable by means of hand operatedscrews 41, one of which is swivelled to each of the blocks. It will bemanifest that upon adjustment of the blocks, the manhole cover restingthereon as disclosed in Figure 7, will be raised to the desired height.1

After the manhole cover has been adjusted to the desired height, it issecurely heldv against movement by means of set screws 42 passingtransversely through the annular flange 36. I

In order to make use of the portable grinder disclosed in Figures 14inclusive, a base plate 43 is mounted to one side of the turn-table andarising therefrom is a substantially semi-circular casting 44 whichprojects above the turn-table and manhole cover contained therein. Whenusing the portable grinder for grinding manhole covers, the flangedrollers 9 are arranged on the casting 44 with two of the rollers at theends of the latter. Upstanding plates 45 are-carried by the ends of thecasting and project in thepath of the rollers to retain the grinderagainst rotation. To further stabilize the grinder on the casting ananchor bolt 46 passes vertically through a central opening 47 in thecarriage and is anchored tothe base plate 43;

With the abrasive element in operation as above stated, the turn-tableis slowly rotated to bring the surface of the manhole cover in contactwith the abrasive element.

I claim:

1. In a grinding machine, a circular track to be mounted-directly upon acircular body to be operated upon, a carriage rotatable on the trackway,and an abrasive element associated with the carriage and adapted tocontact With the work as the carriage is rotated.

2. In a grinding machine, a circular trackway to be applied upon one endof a circular body to be operated upon, a carriage arranged above thetrackway, rollers carried by the carriage and movable on the trackway,and an abrasive element mounted on the carriage and adapted to contactwith the work as the carriage is rotated.

, 3. In a grinding machine, a circular trackway to be applied upon oneend of a circular body to be operated upon, a carriage arranged abovethe trackway, rollers carried by the carriage and movable on thetrackway, and an abrasive element mounted on the carriage and adapted tocontact with the work as the carriage is rotated, and means foradjusting the abrasive element to the surface to be ground.

4. In combination a circular trackway to be mounted directly on acircular body to be operated on, a carriage movable on the trackway, avertically andlaterally adjustable motor mounting carried by thecarriage, a motor attached to the mounting, and a surface finishingelement fixed to the motor shaft.

Si ned at Miami, in the county of Dade and State of Florida, this 24thday of August, 1928.

CHARLES H. LYNE.

